Soybean (scientific name: Glycine max (L.) Merr) is commonly called soybean. Leguminosae is an annual herb with a height of 30-90 cm. Stems are stout, erect and densely covered with brown bristles. Leaves usually 3-foliolate; Stipules veined and yellow pilose; Petiole 2-20 cm long; Leaflets broadly ovate, papery; Racemes are short with few flowers and long with many flowers; The total pedicel usually has 5-8 sessile, tightly packed flowers; Bracts lanceolate, strigose; Bracteoles lanceolate, appressed bristles; Calyx is lanceolate, with purple, lavender or white flowers, pedicel at the base, and petaloid wings. Pods are fat, slightly curved, drooping, yellow-green, densely covered with brown-yellow long hair; 2-5 seeds, oval, nearly spherical, smooth seed coat, light green, yellow, brown and black and so on. The flowering period is from June to July, and the fruiting period is from July to September.